28 ✖ 7 = 196
12 ✖ 6,5 = 78
= 196+78 = 274
= 274 : (28+12)= 6,85
= A. 6,85
Jawab:
Rata² 28 lk =7
Rata² 12 Pr= 6,5
28a:12a =7a:3a
7 - 6,5 = 7a+3a
0,05= a
Rata² total = 7 - 3(0,05) = 6,85
Atau =6,5 + 7(0,05) = 6,85
Maaf cara cepat saya ini :v
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28 ✖ 7 = 196
12 ✖ 6,5 = 78
= 196+78 = 274
= 274 : (28+12)= 6,85
= A. 6,85
Jawab:
Rata² 28 lk =7
Rata² 12 Pr= 6,5
28a:12a =7a:3a
7 - 6,5 = 7a+3a
0,05= a
Rata² total = 7 - 3(0,05) = 6,85
Atau =6,5 + 7(0,05) = 6,85
Maaf cara cepat saya ini :v